Minolta Di200 Service Manual page 173

C0500,C0510
Step
1 Fusing Roller Heater Lamp turns ON when the
Side Cover is opened and closed.
2 The resistance of Fusing Roller Thermistor
(across CN25-2 and 3 on the Fusing Unit end)
is infinity.
3 There is continuity across CN3-1 and 2 on the
Fusing Unit end.
4 Fusing Roller Heater Lamp is conducting.
5 Fusing Roller Thermostat is conducting.
6 Fusing Roller Heater Lamp Fuse is conducting.
7 There is continuity across 1A and 1B, and
across 2A and 2B, when Side Cover Interlock
Switch 2 is actuated.
C0520
Step
1 Fusing Roller Thermistor is dirty.
2 The circuit across CN25-2 and -3 on the Fus-
ing Unit end is shorted.
Check
Check
T-38
Result Action
NO Check step 3 and onward.
YES Change Fusing Roller
Thermistor.
NO Change Master Board.
YES Check step 7.
NO Change Fusing Roller
Heater Lamp.
NO Change Fusing Roller
Thermostat.
NO Change Fusing Roller
Heater Lamp Fuse.
YES Change Power Supply
Unit.
Change Master Board.
NO Change Side Cover Inter-
lock Switch 2.
Result Action
YES Clean.
YES Change Fusing Roller
Thermistor.
NO Change Master Board.